S-SERIES INSTRUMENTSProper connector insertion and power to cluster isassured if the following Indicators react when keyswitch is turned on:1.Voltmeter pointer moves up scale.2.Some warning lights come on (depends oninstallation).3.Electric gauges Indicate zero.With power to cluster off, electric gauge pointersmay move to any point on gauge scale. This is acharacteristic of this type of gauge and does notindicate a faulty part.GAUGE QUICK CHECKSIfa universal gauge tester is not available, electricalgauges can also be "quick-checked" to determine if theyare functioning by a simple "Sender Disconnect andGround Test" (Table 2). While this a quick test, it doeshave two disadvantages.1.The test tells only that gauge Is functioning. It does notdetermine if gauge is accurate.2.The grounding of sender wire test for a temperaturegauge will damage that unit.FUEL LEVEL GAUGEOperationThe electric fuel gauge system consists of two basiccomponents - the instrument cluster mounted gauge andthe fuel tank sending unit. The tank unit controls thegauge and the gauge registers the quantity of fuel in thetank. The two units are connected electrically as shownin Figure 18.Figure 18 - Fuel Gauge Circuit DiagramTABLE 2GAUGE QUICK CHECK(Sender Wire Disconnect and Ground Test)Gauge Reading (With Key Switch "ON")Type of GaugeWith SenderWith SenderWire DisconnectedWire GroundedFuel LevelAbove Full ScaleBelow Low ScaleOil PressureAbove Full ScaleBelow Low ScaleWater TemperatureBelow Low ScaleDo Not Ground*Oil Temperature:EngineBelow Low ScaleDo Not Ground*TransmissionBelow Low ScaleDo Not Ground*Rear AxleBelow Low ScaleDo Not Ground**Grounding temperature sender wire will burn out gauge.CTS-4140Y - Page 9
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